Double rack



FIG. 1 is a top perspective view for a double rack showing my new design;

FIG. 2 is a front side view thereof;

FIG. 3 is a back side view thereof;

FIG. 4 is a top side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a bottom side view thereof;

FIG. 7 is a left side view thereof;

FIG. 8 is an upper rear perspective view; and,

FIG. 9 is a lower front perspective view. 

CLAIM The ornamental design for a double rack, as shown and described. 